khoj has an unauthenticated path traversal in /home/ endpoint that allows file read from server filesystem
### Summary
The `/home/{file_path:path}` endpoint in `web_client.py` serves static files by directly concatenating the user-supplied `file_path` with the `home_directory` constant. There is no path traversal filtering, no path normalization check, and no authentication required. An attacker can use `../` sequences to read arbitrary files from the server filesystem.
### Details
**Vulnerable code** — `src/khoj/routers/web_client.py` lines 46-49:
```python
@web_client.get("/home/{file_path:path}", response_class=FileResponse)
def home_static_files(file_path: str):
"""Serve static files from the home landing page directory"""
return Fil
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